Contents

The team investigate when the body of a Federal Marshal is found in the bathroom on a plane and Danny is stunned when he learns that the victim is someone he knew. The stakes are then raised after Grace is kidnapped and Danny soon discovers that the person responsible for the killing is none other his former New Jersey partner who has arrived in Hawaii, hellbent on getting revenge on Danny. With Grace's life in the balance, Danny must do whatever his former partner says or risk losing Grace forever...

As the investigation progresses further, the team discover that the prisoner the victim was escorting, "Rick Maguire" is an alias as the real "Rick Maguire" died two years previously.

It's soon discovered that the main suspect in Rick Peterson, Danny's ex-partner from his days as a cop in New Jersey. After being found guilty of corruption, a trial that Danny also testified in, Peterson was jailed for ten years and ended up losing everything including his wife and family.

Now consumed by revenge, Peterson has come to Hawaii to get back at Danny.

When Grace is kidnapped by Peterson posing as an officer of the Honolulu Police Department, Danny goes off the grid to comply with Peterson's demands and furthermore, Danny is by himself as Peterson has also cloned Danny's phone, essentially gaining access to the contacts on Danny's phone which include members of the HPD and H50.

Peterson and Danny then meet with Peterson telling Danny to kill Stan Edwards, the current husband of Danny's ex, Rachel so that Danny himself would end up going to jail for murder and ultimately end up losing Grace forever.

As Danny and Stan meet, the rest of H50, having discovered that Peterson was taking photos of Grace discover Peterson's intentions and race to stop the plan from going ahead.

Lieutenant Commander Steve McGarrett (2010) arrives to stop Danny, only for Danny to shoot Stan. As Steve races to the scene, he discovers that Danny simply shot Stan in the arm, wounding him so that he could trick Peterson.

As Kono and Chin, Danny confronts Peterson, demanding that Peterson reveal where Grace is but when Peterson refuses, Danny responds by shooting Peterson in the right kneecap which leaves Kono horrified and stunned.

As Peterson lies on the ground, wounded, Danny tells him to give up the location or else he will shoot Peterson in the head.

Peterson eventually relents and reveals that Grace is being held in a storage container.

Steve and Danny race to the container and eventually find Grace with Danny, Rachel and Grace all having an emotional reunion as Steve, Chin and Kono all look on.

Danny's former partner in New Jersey who arrived in Hawaii, hellbent on seeking revenge against Danny who testified at his trial ten years previously which ultimately led to Peterson being jailed. After kidnapping Grace, Danny's daughter, he attempts to get Danny to kill Stan Edwards so that Danny would go to prison, but Danny fakes it by shooting Stan in the shoulder before shooting Peterson in the right kneecap and then threatening to shoot him in the head if Peterson doesn't tell him where Grace is.